Table 2.

Coefficients of correlation between the serum values of reactive oxygen metabolites (dROMs) and the levels of thiol antioxidant barrier (SHp) and antioxidant barrier (Oxy-ads), homocysteine (Hcy), creatine kinase (CK), lactate dehydrogenase (LDH) and aspartate aminotransferase (AST) obtained from racehorses competing in official races of 1200 (Group 1), 1600 (Group 2) and 2000 m (Group 3). Blood samples were collected from each horse 1 week prior to the race (1WB), the day of the race at rest (TREST), immediately after the race (TPOST), and after 30 (TPOST30) and 120 min (TPOST120). p-values < 0.05 were considered statistically significant.

		Parameters
GROUP 1		Hcy	SHp	Oxy-ads	CK	LDH	AST
		(μmol/L)	(μmol/L)	(μmol/L)	(U/L)	(U/L)	(U/L)
dROMs (U Carr)	1WB	r = −0.09	r = −0.003	r = −0.04	r = 0.27	r = 0.26	r = 0.53
		p = 0.80	p = 0.99	p = 0.93	p = 0.46	p = 0.47	p = 0.11
	TPRE	r = −0.40	r = 0.24	r = −0.22	r = −0.26	r = −0.002	r = 0.34
		p = 0.26	p = 0.51	p = 0.54	p = 0.47	p = 0.99	p = 0.34
	TPOST	r = 0.90	r = 0.72	r = 0.87	r = 0.13	r = 0.03	r = 0.10
		p = 0.004	p = 0.02	p = 0.001	p = 0.72	p = 0.94	p = 0.78
	TPOST30	r = 0.86	r = 0.85	r = 0.64	r = 0.35	r = 0.16	r = 0.15
		p = 0.001	p = 0.002	p = 0.04	p = 0.34	p = 0.66	p = 0.67
	TPOST120	r = 0.98	r = 0.98	r = 0.87	r = 0.22	r = −0.20	r = 0.27
		p < 0.0001	p < 0.0001	p = 0.001	p = 0.54	p = 0.58	p = 0.45
GROUP 2		Hcy	SHp	Oxy−ads	CK	LDH	AST
		(μmol/L)	(μmol/L)	(μmol/L)	(U/L)	(U/L)	(U/L)
dROMs (U Carr)	1WB	r = −0.43	r = 0.04	r = 0.58	r = 0.20	r = 0.33	r = 0.25
		p = 0.22	p = 0.92	p = 0.08	p = 0.57	p = 0.35	p = 0.48
	TPRE	r = −0.33	r = 0.35	r = −0.32	r = −0.53	r = −0.43	r = 0.42
		p = 0.35	p = 0.33	p = 0.36	p = 0.09	p = 0.21	p = 0.23
	TPOST	r = 0.69	r = 0.77	r = 0.68	r = −0.04	r = −0.20	r = −0.16
		p = 0.03	p = 0.009	p = 0.03	p = 0.91	p = 0.57	p = 0.67
	TPOST30	r = 0.93	r = 0.73	r = 0.91	r = −0.07	r = 0.08	r = 0.38
		p = 0.0001	p = 0.02	p = 0.0002	p = 0.84	p = 0.82	p = 0.27
	TPOST120	r = 0.99	r = 0.97	r = 0.95	r = 0.13	r = −0.21	r = −0.22
		p < 0.0001	p < 0.0001	p < 0.0001	p = 0.73	p = 0.56	p = 0.57
GROUP 3		Hcy	SHp	Oxy−ads	CK	LDH	AST
		(μmol/L)	(μmol/L)	(μmol/L)	(U/L)	(U/L)	(U/L)
dROMs (U Carr)	1WB	r = −0.24	r = −0.37	r = −0.08	r = 0.51	r = 0.44	r = 0.37
		p = 0.50	p = 0.30	p = 0.83	p = 0.13	p = 0.21	p = 0.30
	TPRE	r = 0.10	r = −0.12	r = −0.18	r = 0.002	r = −0.35	r = 0.22
		p = 0.79	p = 0.73	p = 0.62	p = 0.99	p = 0.31	p = 0.54
	TPOST	r = 0.88	r = 0.83	r = 0.81	r = 0.03	r = 0.58	r = 0.31
		p = 0.0007	p = 0.003	p = 0.004	p = 0.93	p = 0.08	p = 0.39
	TPOST30	r = 0.99	r = 0.97	r = 0.96	r = 0.60	r = −0.04	r = 0.40
		p < 0.0001	p < 0.0001	p < 0.0001	p = 0.07	p = 0.90	p = 0.25
	TPOST120	r = 0.98	r = 0.97	r = 0.94	r = −0.05	r = −0.14	r = 0.08
		p < 0.0001	p < 0.0001	p < 0.0001	p = 0.90	p = 0.70	p = 0.83